This video as a text article: https://blog.nicco.love/google-drms-the-web/
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The same host could fake the payload to the attestation server. Cat and mouse game with security through obscurity.
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If you are on android or ios the phone already cryptografically verifies that the operating system has not been tampered with on a hardware level. Since the operating system is then “trusted” it can verify anything you do on it
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